Right now, there should be another 100 or so obsolete J7, Mirage III/5 remaining.
All of them in theory could be upgraded with RD-33 or WS-13 turbofan...
The Pakistani Mirage III and 5 airframes are between 40 to 50 years old.
The ROSE acquisition and upgrade programme was in my view a logical, well thought out, and successful programme. This resulted in increased numbers, an upgraded aircraft, and developmental work for the Pakistani aviation industry.
The fact remains though, that the ROSE programme was terminated about 20 years ago now.
The time is approaching within the next 5 years or so to replace these fighters...hence the JF-17 programme and acquisition of the J-10.